Not Open Contribution
If SQLite is written by a group of friends who are not seeking other developers to share their load, then indeed one can't complain that what has happened violates other people's rights. Also, the article did note that they're willing to make exceptions for people who feel uncomfortable with parts of the code of conduct.
None the less, I think it's entirely legitimate to react to this as a joke in extremely poor taste.
If one removes the rules in that list that are explicitly religious in nature, or which are appropriate to members of a monastic order, there would not be all that much left.
However, that being said, I would have no objection to a Benedictine monastery releasing open-source software. The shock is largely at unexpectedly finding something that one would have expected to be a secular institution adopting non-pluralistic values.